San Joaquin River, California

Bacey J, Spurlock F, Stamer K, Feng H, Hsu J, White J, Tran DM (2005) Residues and toxicity of esfenvalerate and permethrin in water and sediments, in tributaries of the Scaramento and San Joaquin Rivers, California, USA. Bull Environ Contam Toxicol 74 864-871... 

Gillion RJ, Clifton DG. 1990. Organochlorine pesticide residues in bed sediments of the San Joaquin River, California. Water Resources Bulletin 26 11-24. 

Figure 9 10 Seasonal discharge and N dynamics in the San Joaquin River (California, USA). Monthly average discharge (A), DIN (closed circles), DON (open circles), TN (open triangles), and PN (closed, inverted triangles) concentrations (B), and loads (C) are shown. Data from...

A model of the dynamics of phytoplankton populations based on the principle of conservation of mass has been presented. The growth and death kinetic formulations of the phytoplankton and zooplankton have been empirically determined by an analysis of existing experimental data. Mathematical expressions which are approximations to the biological mechanisms controlling the population are added to the mass transport terms of the conservation equation for phytoplankton, zooplankton, and nutrient mass in order to obtain the equations for the phytoplankton model. The resulting equations are compared with two years data from the tidal portion of the San Joaquin River, California. Similar comparisons have been made for the lower portion of Delta and are reported elsewhere (62). 

Bergamaschi, B. A., Baston, D. S., Crepeau, K. L., and Kuivila, K. M., Determination of pesticides associated with suspended sediments in the San Joaquin River, California, U.S.A, using gas chromatography-ion trap mass spectrometry, Toxicol. Environ. Chem., 69, 305-319, 1999. 

Boron accumulates in both aquatic and terrestrial plants but it does not seem to biomagnify in the food chain. Boron does not biomagnify in aquatic food chains and has low potential to accumulate in aquatic organisms, as judged by studies in the San Joaquin River, California,... 

Aquatic organisms were impacted by diazinon water concentrations between 0.3 and 1.2 jig/L effects included lowered emergence and elevated drift of stream insects (0.3ttg/L), reduced fecundity of marine minnows (0.47 ixg/L), accumulations in freshwater teleosts (0.55 p,g/L), and daphnid immobilization (1.0p.g/L) and death (1.2p,g/L). These comparatively low levels are of concern because transient peak water concentrations of 4.0-200.0 ttg diazinon/L have been recorded near diazinon sheep-dipping sites in England, and 36.8 ttg/L in the Sacramento-San Joaquin River, California. For protection of sensitive aquatic organisms, a water diazinon level should not exceed 0.08 p-g/L. This value represents a safety factor of about 4 over the lowest recorded adverse effect level of 0.3 pg/L. For protection of freshwater aquatic life, an average 4-day concentration of 0.04 pg diazinon/L is recommended, provided that this value is... 

Domagalski, J.L. Dubrovsky, N.M. Kratzer, C.R. Pesticides in the San Joaquin River, California Inputs from dormant sprayed orchards. J. Environ. Qual 1997,26,454-465. 

Spencer, R.G.M., Pellerin, B.A., Bergamaschi, B.A., Downing, B.D., Kraus, T.E.C., Smart, D.R., Dahlgren, R.A., and Hemes, P.J. (2007). Dinmal variability in riverine dissolved organic matter composition determined by in sitn optical measurement in the San Joaquin River (California, USA). Hydrol. Process., 21, 3181-3189. 

Two major rivers in California influenced by a Mediterranean climate are the Sacramento River and the San Joaquin River. The Sacramento River drains 72,132 km with a relief of 4,317 m. Mean discharge is 650 m /s with peak flows in the winter and early spring and with minimum flows in the late summer and early fall. The San Joaquin River drains 83,409 km with a relief of 4,418 m. Mean discharge is 130 m /s with peak flows in spring and low flows in late summer and fall. Population density is 24 people/km in the Sacramento River basin and 29 people/km in the San Joaquin basin. Agriculture in the Central Valley of California that encompasses parts of both basins is the primary user of water in both basins [1]. 

Fig. 1 Map of the Delta in central California, USA with the California state map inset to show location within the state. The Delta is formed at the confluence of the Sacramento River and the San Joaquin River. Export of water from the Delta occurs mainly from the State Water Project pumping plant and the Central Valley Project pumping plant in the south Delta...

Muscle, Wisconsin California San Joaquin River September-November 1986 whole fish 0 FW 1... 

Saiki, M.K., M.R. Jennings, and W.G. Brumbaugh. 1993. Boron, molybdenum, and selenium in aquatic food chains from the lower San Joaquin River and its tributaries, California. Arch. Environ. Contam. Toxicol. 24 307-319. 

Striped bass, Morone saxatilis California whole juveniles San Joaquin River ... 

California San Joaquin River 1987 maximum concentrations recorded Water 0.025 FW 122... 

Less than 10% of the sediment samples taken from the San Joaquin River and its tributaries in California (an area of heavy organochloride pesticide use) in 1985 contained mirex residues all samples contained less than 0.1 pg/kg (ppb) (Gilliom and Clifton 1990). 

Western San Joaquin Valley, California River waters Surface waters Groundwaters... 

Kuivila KM. 1993. Diazinon concentrations in the Sacramento and San Joaquin Rivers and San Francisco Bay, California, February 1993. In Water Fact Sheet, U.S. Geological Survey, Department of Interior. 

Panshin SY, Dubrovsky NM, Gronberg JM, Domagalski JL (1998) Occurrence and distribution of dissolved pesticides in the San Joaquin River Basin, California U.S. Geological Survey Water-Resources Investigations Report 98-4032, p 88... 

House MA, Wernicke BP, Farley KA, Dumitru TA (1997) Cenozoic thermal evolution of the central Sierra Nevada, CA from (U-Th)/He thermochronometry. Earth Planet Sci Lett 151 167-179 Huber NK (1981) Amount and timing of late Cenozoic uplift and tilt of the central Sierra Nevada, California— Evidence from the upper San Joaquin River basin U.S. Geological Survey Prof Pap 1197, 28 p. 

Giddings, J.M., L.W.J. Hall, and K.R. Solomon (2000). An ecological risk assessment of diazinon from agricultural use in the Sacramento-San Joaquin River basins, California. Risk Anal., 20 545-572. 

B. L. Ingram, P. K. Weber, Salmon origin in California s Sacramento-San Joaquin river system as determined by otolith strontium isotopic composition Geology, 27 (1999), 851-854. 

As an example of the application of the equations proposed herein, consider the phytoplankton and zooplankton population observed at Mossdale Bridge on the San Joaquin River in California during the two years 1966-1967. Mossdale is located approximately 40 miles from the confluence of the San Joaquin and the Sacramento Rivers. The data presented below have been supplied to the authors by the Department of Water Resources, State of California (64), as part of an ongoing project to assess the effects of proposed nutrient loads and flow diversions on the water quality of the San Francisco Bay Delta. A more complete report of this investigation is forthcoming (62). 

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